液货船，顾名思义是载运（），而内河船舶所运输的散装液体货物大多具有易燃性、易爆性、毒害性及污染性等特征。

A.散装油类船舶

B.散装液体货物的船舶

C.散装化学品船

An analog signal’s characteristic quantity representing data may 66) . at any instant, any value within a continuous (67) . For example, an analog signal may follow continuously the values of another physical quantity representing data.

A discrete signal is composed of (68) elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform, (69) , and position in time. A digital signal is a special case of discrete signals, in which data are represented by a (70) number of well-defined discrete values that one of its characteristic quantities may take in time.

（66）处填（）。

A．acquire

B．collect

C．assume

D．fetch